Mortising-machine.



No. 803,369. PATENTED OCT. 31, 1905.

' c. J. STAFFORD.

MORTISING MACHINE.

APPLICATION rnnn JULY 27. 190A.

I l O E Q1 x v mgi I Z B BY I I ATTYs.

CURTIS J. STAFFORD, OF BAKERSFIELD, OALIFORNIA.

MORTISING-IVIACHINE.

Specification of Letters Patent.

Patented Oct. 31, 1905.

Application filed July 27,1904. Serial No. 218,430.

To all whom it may concern:

Be it known that I, CURTIS J. STAFFORD, a citizen of the United States,residing at Bakersfield, in the county of Kern, State of California,have invented new and useful Improvements in Mortising-Machines, ofwhich the following is a specification.

My invention has relation to means to make mortises in doors and thelike; and the object is to provide a simple machine which will rapidlymake a mortise and leave the mortise clean of all cuts and burs and willbe convenient of access and simple in its operation. I accomplish theseobjects by means of the device described herein and shown in theaccompanying drawings, in which- Figure 1 is a side elevation of amortisingmachine embodying my invention, one-half thereof being incentral vertical section. Fig. 2 is an edge view of the same, showingthe table or support to which the machine is bolted.

.In the drawings, A represents the supporting side plates or frame ofthe machine, and B represents the core or center frame shown in verticalsection in Fig. 1. Between these side plates are rotatably mounted inthe upper end a disk O and in the lower end a sprocket-wheel D. In thedrawings is shown a composite endless cutting-chain made up of aplurality of cutters or cutting-links E and F. The cutters E and F carryon their outer edges cutting-points E and F, respectively. The centralcutters E are ,pivotally secured between the outer cutters F andtogether form an endless cutting sprocket-chain extending around thedisk and sprocket-wheel, as above stated. The sprocket-teeth D projectout and into the space X between ends of the cutters E E, and therebycompel the sprocket-chain to move with the sprocketwheel, which is keyedon the driving-shaft G, from which power is obtained to operate thedevice.

In order to provide means to give the proper tension to the cuttingsprocket-chain, I have divided the side plates into upper and lowermembers A and A, respectively, in order that they may be spread apart,and thereby tighten the chain, and to hold these plates in theiradjusted position I have also provided the adjusting-plate J, whichextends over and bears against these side plates. Thebolt I passesthrough and carries the adjusting-plate, and when the device is boltedin place, as on the support H, it will bind the adjusting-plate Jfrictionally tight against these plates and prevent the movement of theside plates with reference to each other and at same time hold thedevice in place on the support. By this means any undesirable slack inthe chain is easily removed.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is I 1. A mortising-machine, comprising a core orcenter frame, supporting side plates, means for adjustably securingthem,a disk, sprocket wheel and chain extending over the disk andsprocket-wheel and between the edges of the side plates.

2. In a mortising-machine, the combination with a core or center frame,supporting side plates, disk, sprocket-wheel and endless cutting chainextending over said disk and sprocketwheel, of asupport H, anadjustingplate J and bolt I for binding the adjustingplate frictionallytight against the side plates.

In witness that I claim the foregoing I have hereunto subscribed my namethis 20th day of July, 1904.

CURTIS J. STAFFORD.

,Witnesses:

FRANK C. ASTON, JOHN B. JAMEs.

